<div class="wrap">
    <div class="top">
        <img class="preview" />
        <div class="btns">
            <div class="btn img">
                <span>更换图片</span>
                <input type="file" accept=".jpg,.jpge,.png" />
            </div>
            <span class="btn level">一级难度</span>
            <span class="btn reset">重新开始</span>
        </div>
    </div>
</div>
